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Algae scrubbers, otherwise known as "chaeto killers" because of the high filtering capacity compared to chaeto reactors, have the fastest and strongest rate of removal of nutrients from aquarium water of any type of natural algal filtration. All natural reefs, lakes and rivers are naturally filtered by algae.

The RAIN4 is the biggest RAIN, but the RAIN2 was the first; The RAIN2 is smaller and more affordable, and available with 1, 2 or 4 of our GEM5 (tm) lights here:

The RAIN (tm) waterfall algae scrubber is the first new design from anyone anywhere since we introduced the first waterfall design in the year 2008. Back then it was simply designed to fit under the tank that we had at the time. It took a lot of time to remove and clean, and had other issues, but it was not for sale so it did not matter.

Since then all waterfall designs for sale by anyone have copied that design. That original design was ok at the time (you can find it posted on forums by searching "waterfall turf algae filter cheap and easy to build santamonica forum"

Well, now it is 2018 and almost all the shortcomings of that original waterfall design have been overcome with our new patent pending RAIN designs. From the Green Grabber® 3D printed screen, to the underwater submersible and safe low-voltage (but high wattage) UL listed GEM5 (tm) lights, to the pole mount super low space requirement mounting system, we really hope you like the RAIN4.

Here is a customer's RAIN4 with the red cap removed. Can you tell what caused the empty spots on the screen, from looking at the growth on the tray?

Answer: The growth got too thick, too fast, before the customer cleaned/harvested it. So it let go and landed on the tray. This RAIN is still fairly new so the attachment is not as strong as it will be later, so more often cleaning is needed when the screen gets thick and heavy quickly. Also, as is typical on new scrubber installations, the nutrients in the water are high and causing this darker, thicker growth.

No worry however, because the RAIN cannot overflow onto your flow, ever, because it's on your sump.